Sure! Here are the completed sentences with the correct tense or form of the verbs in parentheses:

1. Acne **affects** 70 - 80% of young people. (affect)
2. How about **meeting** at 6 p.m. outside the theatre? (meet)
3. My mother loves **listening** to music. (listen)
4. Where **did you visit** last Summer? – Hoi An city. (visit)
5. Jess always **wears** glasses when he goes out. (wear)
6. **Did you watch** TV last night? – Yes, I did. (watch)
7. Yesterday **was** Mary’s birthday but she **did not hold** a party. (be/not hold)
8. The event **opens** on 2nd of August and **finishes** on 4th of October. (open/finish)
9. My father **is not** a teacher. He works in a hospital. (not/be)
10. I **was** doing charity when I **was** a first-year student. (start/be)
11. We **became** a member of Green School Club last year. (become)
12. My friend hates **reading** magazines. (read)
13. Let’s **go** to see the water puppet show this Sunday. (go)

Hope this helps!